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Analysis of Computer Networks Courses in Undergraduate Computer Science, Electrical Engineering and Information Science Programs Session 2158 Analysis of Computer Networks Courses in Undergraduate Computer Science, Electrical Engineering and Information Science Programs Maurice F. Aburdene, Xiannong Meng and Gregory L. Mokodean Bucknell University Abstract This paper presents an analysis of computer networks courses offered by universities and colleges in the departments of computer science, electrical engineering, or information science. The results are based on the information collected from course web sites from twenty-seven universities and colleges in computer science, electrical engineering and information science departments, primarily within the United States. The data analyzed include the course titles, course structure, textbooks used, major topics and how they are covered, projects, and laboratory exercises, if any. We found that the courses can be divided into three categories: those that cover the general topics of computer networks using some practical examples, those that specifically discuss Internet protocols, and those that work through a set of programming projects after students have had a previous network course. 1. Introduction Pervasive use of the Internet, especially the World Wide Web (the web) has made teaching computer network courses a necessity for many universities and colleges. Students take network related courses hoping to gain first-hand knowledge of how the Internet works, how the web works, how to set up an operational network and how to program the network to deliver various applications. In this paper, we summarize characteristics of computer network courses from the web sites of 27 universities and colleges, mainly from the U.S. and from two other countries. We wanted to cover a variety of schools with different structures and objectives, including both public and private, predominately undergraduate and graduate, and different regions of the US, from what was available on the web. We examined how the course is taught, what textbooks are used, which subjects and practices are covered in laboratory exercises, if any, and the topics of course projects. In general, three approaches are used to cover the main topics: bottom-up, which starts at the lowest (physical) layer of the protocol and works its way up; top-down, which starts from higher layers such as applications; and a mix of the two. Five textbooks dominate the required reading material. While most courses involve some projects, a few actually have dedicated weekly laboratory exercises. The contents of projects and laboratory exercises vary, and include: looking at the design and implementation protocols, programming actual network processors, writing client-server software in various programming languages, setting up operational network hardware and software, and experimenting with protocols using network simulation software. 9.206.1 Page “Proceedings of the 2004 American Society for Engineering Education Annual Conference & Exposition Copyright 2004, American Society for Engineering Education” We found a wealth of information about computer networks courses in this study. The analysis will help us revise our own network courses in both the electrical engineering and the computer science departments. We believe this information will be useful to our colleagues at other universities and colleges as well. There have been various surveys and studies about laboratory components of computer network courses such as 1,2,3,5,6,7,9,10,12,16,17,18 . There are also papers describing how a network course should be conducted 4, 11, 15, 20 . We have yet to find a general course survey across multiple disciplines and multiple schools such as the one we are presenting now. The paper is organized as follows: Section 2 describes how this study was conducted. Section 3 discusses how the subject of computer networks is covered, bottom-up or top-down. Section 4 reviews the textbooks used in the network courses surveyed. Section 5 examines the subject and contents of the laboratory exercises. Section 6 describes the course projects. Section 7 addresses the issue of course objectives, outcomes, and assessments. Section 8 presents some observations and concluding remarks. The Appendix lists a summary of the data used in this study. 2. Method of Study The information used in this study was collected from course web sites. The materials for each course contain at least a course description. Of the 61 web sites we visited, 27 have actual course materials such as syllabus, assignments, lecture schedules and assessment methods available on line; 42 listed their choice of textbooks, including the ones that indicate explicitly that no textbooks are used. The 61 courses come from a total of 27 different schools, all of which are from the U.S. except for one from Hong Kong and one from Australia. Most schools in our study offer network course(s) in more than one department and some offer courses at both the undergraduate and graduate levels. There are 16 different department names in the 61 courses studied, including “Electrical Engineering”, “Computer Science”, “Computer and Information Science”, and “Telecommunications and Networking”. The course names have 36 different varieties, such as “Computer Networks”, “Data Communications”, “Network Essentials”, and “Information Networks”. One caveat of this type of study is that the information is collected from the web and reflects only the facts available at the time the information was collected. Also some of the information comes from course offerings in the previous semesters or years. A summary of the data can be found in the Appendix. 3. Top-down, Bottom-up or something in between There are three different approaches to cover the network subjects among the courses we surveyed: top-down, bottom-up, and a mix of the two. These different approaches have a high correlation with the textbook chosen by the instructor. We will discuss the textbooks in detail in next section. The bottom-up approach starts from the building blocks of computer networks. Most of Page 9.206.2 Page computer science or information science programs use the physical or MAC layer access “Proceedings of the 2004 American Society for Engineering Education Annual Conference & Exposition Copyright 2004, American Society for Engineering Education” protocols as a starting point. Electrical engineering programs may discuss a bit more at the signal level. The topics then are moved up towards data link, network, transport, and application layers. The advantage of this approach is that the students will have a good understanding of the lower layers when they study the higher layers. For example, students will know how packets and frames are formed and used when studying various routing protocols at the network layer. The top-down approach starts from the application and the transport layers then works its way down to the physical layer. This has been a relatively new approach in the recent years. We believe this trend has been strongly influenced by an excellent recent textbook by Kurose and Ross 14 . The advantage of top-down approach is that the course can start with interesting and attractive applications such as World Wide Web and Instant Messenger. Students are more likely to be motivated with real world applications. The courses then proceed with how a system works by “peeling the onion”, one layer at a time. The third is a mix of bottom-up and top-down approaches. Typically, one would start with some interesting applications and then discuss various topics as needed, not necessarily in any fixed order. Of the 27 sets of actual on-line course materials we were able to get, ten used the bottom- up (or very similar) approach, seven used the top-down (or very similar) approach, and ten used some mixed approach. It is interesting to note that the seven courses using the top-down approach all use 14 as the textbook, while the majority of the ten courses using bottom-up approach use 19 . 4. Textbooks Among the course web sites we visited, 42 provided some information about the textbook selection, indicating textbooks used or stating no textbook is required. Thirteen different books are mentioned as the primary texts, with 14 and 19 each listed as the main text for ten courses. Comer’s book 8 is used by three courses, while 21 and 13 are each used by two. The remaining books are used by a single course. We now examine briefly the five textbooks used by more than one course to see the main topics covered in each of the books and how they are covered. Kurose and Ross 14 is the only main textbook that explicitly indicates that the subjects are covered using a top-down approach. After an introductory chapter, it starts with a discussion of the layers in the following order: application, transport, network, and data link. Other subjects of interest, such as multi-media network, network security and network management, follow the presentation of the basic protocol stack. According to the authors, the top-down approach has three main advantages. It places emphasis on the applications, which is a fast-growing area; the applications can be used as a motivation tool to inspire interest in the students; and it enables students to build real applications early on so that they can see the process of applications development. The book by Kurose and Ross is currently in its second edition. Peterson and Davie’s book 19 has a history dating back to 1996. The subtitle of their book, A Systems Approach reveals well the intention of the authors. It starts with lower level protocols, such as encoding, framing, and MAC protocols i.e. Ethernet and token ring. It then moves its way up to packet switching and internetworking, where routing and Internet are discussed. End- Page 9.206.3 Page to-end protocols such as UDP and TCP are then presented. The subjects of network security and “Proceedings of the 2004 American Society for Engineering Education Annual Conference & Exposition Copyright 2004, American Society for Engineering Education” applications are presented last.
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